linux-kernel - Re: [PATCH v3 0/2] allow simple{fb, drm} drivers to be used on non-x86 EFI platforms

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Date:   Thu, 15 Jul 2021 10:11:50 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Javier Martinez Canillas <javierm@...hat.com>,
        linux-kernel@...r.kernel.org
Cc:     linux-efi@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        Catalin Marinas <catalin.marinas@....com>,
        dri-devel@...ts.freedesktop.org, Atish Patra <atish.patra@....com>,
        linux-riscv@...ts.infradead.org, Will Deacon <will@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>, x86@...nel.org,
        Russell King <linux@...linux.org.uk>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Robinson <pbrobinson@...il.com>,
        Borislav Petkov <bp@...e.de>,
        Albert Ou <aou@...s.berkeley.edu>,
        Hans de Goede <hdegoede@...hat.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Palmer Dabbelt <palmer@...belt.com>
Subject: Re: [PATCH v3 0/2] allow simple{fb, drm} drivers to be used on
 non-x86 EFI platforms

Hi

Am 13.07.21 um 18:59 schrieb Javier Martinez Canillas:
> On 6/25/21 3:09 PM, Javier Martinez Canillas wrote:
>> The simplefb and simpledrm drivers match against a "simple-framebuffer"
>> device, but for aarch64 this is only registered when using Device Trees
>> and there's a node with a "simple-framebuffer" compatible string.
>>
>> There is no code to register a "simple-framebuffer" platform device when
>> using EFI instead. In fact, the only platform device that's registered in
>> this case is an "efi-framebuffer", which means that the efifb driver is
>> the only driver supported to have an early console with EFI on aarch64.
>>
>> The x86 architecture platform has a Generic System Framebuffers (sysfb)
>> support, that register a system frambuffer platform device. It either
>> registers a "simple-framebuffer" for the simple{fb,drm} drivers or legacy
>> VGA/EFI FB devices for the vgafb/efifb drivers.
>>
>> The sysfb is generic enough to be reused by other architectures and can be
>> moved out of the arch/x86 directory to drivers/firmware, allowing the EFI
>> logic used by non-x86 architectures to be folded into sysfb as well.
>>
> 
> Any more comments on this series? It would be nice for this to land so the
> simpledrm driver could be used on aarch64 EFI systems as well.
> 
> The patches have already been acked by x86 and DRM folks.

Time to get this merged, I'd say. People are asking for these patches 
already.

Best regards
Thomas

> 
> Best regards,
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer



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